Solubility of modified catalyst-free carbon nanowall with organic solvents

Kwon, Seokhun; Choi, Hyeokjoo; Lee, Seok-Won; Kim, Yonghyeon; Kang, Hyunil

doi:10.1016/j.apsusc.2020.147161

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…There were minimal differences in peak and even in components (O1s: 13.54 atomic %), in Figure 7 b, before PR coating. From some O1s component difference between SMCNW and PR-removed SMCNW, it can be inferred that the functional group on SMCNW surface is slightly modified by the remaining acetone solution after reacting with PR because of SMCNW solubility [ 29 ]. However, comparing the XPS analyses of their chemical bonding, the difference is meaningless.…”

Section: Resultsmentioning

confidence: 99%

“…CNW has unique structural characteristics that differentiate it from other graphite-related materials. Figure 8 shows the Raman spectra of CNW, SMCNW, and PR-removed SMCNW, and the inherent peaks (i.e., D, D’ (edge and defect of graphene), G (sp 2 bonding), and 2D (thickness of graphene) peaks of graphite-related materials) are equally identified [ 29 , 30 , 31 , 32 , 33 ]. The results obtained through the five trials for each sample (CNW, SMCNW, and PR-removed SMCNW) showed almost constant intensity.…”

Section: Resultsmentioning

confidence: 99%

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Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

et al. 2020

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The application of a carbon nanowall (CNW) via transfer is very demanding due to the unusual structure of vertically grown wall-shaped that easily collapses. In addition, direct growth on a device cannot obtain a precision-patterned shape because of the temperature limit of the photoresist (PR). Therefore, in this paper, we demonstrate a new CNW surface micromachining technology capable of direct growth. In order to reduce unexpected damage caused by chemical etching, a physical force was used to etch with the adhesive properties of CNWs that have low adhesion to silicon wafer. To prevent compositing with PR, the CNW was surface modified using oxygen plasma. Since there is a risk of surface-modified CNW (SMCNW) collapse in an ultrasonic treatment, which is a physical force, the CNW was coated with PR. After etching the SMCNW grown on PR uncoated area, PR was lifted off using an acetone solution. The effect on the SMCNW by the lift-off process was investigated. The surface, chemical, and structural properties of PR-removed SMCNW and pristine-SMCNW were compared and showed a minimal difference. Therefore, the CNW surface micromachining technique was considered successful.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

et al. 2020

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“…CNW has a variety of edge shapes. In previous studies, shapes and patterns such as zigzags and rounds were found [25,26]. Although not reported in the literature, the round shape contains the largest pores and is suitable for nanoparticle embedding.…”

Section: Morphological Characterization For Plasmonic Nanoparticlesmentioning

confidence: 93%

Surface-Enhanced Raman Spectroscopy (SERS) Investigation of a 3D Plasmonic Architecture Utilizing Ag Nanoparticles-Embedded Functionalized Carbon Nanowall

Kim,

Hong,

Choi

2023

Nanomaterials

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Surface-enhanced Raman scattering (SERS) is a highly sensitive technique for detecting DNA, proteins, and single molecules. The design of SERS substrates plays a crucial role, with the density of hotspots being a key factor in enhancing Raman spectra. In this study, we employed carbon nanowall (CNW) as the nanostructure and embedded plasmonic nanoparticles (PNPs) to increase hotspot density, resulting in robust Raman signals. To enhance the CNW’s performance, we functionalized it via oxygen plasma and embedded silver nanoparticles (Ag NPs). The authors evaluated the substrate using rhodamine 6G (R6G) as a model target molecule, ranging in concentration from 10−6 M to 10−10 M for a 4 min exposure. Our analysis confirmed a proportional increase in Raman signal intensity with an increase in concentration. The CNW’s large specific surface area and graphene domains provide dense hotspots and high charge mobility, respectively, contributing to both the electromagnetic mechanism (EM) and the chemical mechanism (CM) of SERS.

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Effects of Plasma Ions/Radicals on Kinetic Interactions in Nanowall Deposition: A Review

Ishikawa

2024

Adv Eng Mater

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Recent advances in the growth of carbon nanowalls (CNWs) and vertical graphene nanosheets using various plasma‐enhanced chemical vapor deposition methods are reviewed in this paper. Growth methods are classified into hot‐ and cold‐wall reactors equipped with diverse plasma generation systems, and their respective characteristics are summarized, with particular attention to the behavior of reactive species, such as ions and radicals, generated within the plasma. Recent progress in this research domain is outlined for each method, and an organized account of the chemical kinetic phenomena occurring within the plasma is provided. Finally, future perspectives are discussed. Fundamental data are obtained through real‐time in situ measurements of ions and radicals, and the construction of a database from these data offers microscopic insights that significantly enhance processing outcomes for macroscopically controlling the mechanical shapes and chemical properties of CNWs.This article is protected by copyright. All rights reserved.

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Solubility of modified catalyst-free carbon nanowall with organic solvents

Cited by 5 publications

References 36 publications

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

Innovative Method Using Adhesive Force for Surface Micromachining of Carbon Nanowall

Surface-Enhanced Raman Spectroscopy (SERS) Investigation of a 3D Plasmonic Architecture Utilizing Ag Nanoparticles-Embedded Functionalized Carbon Nanowall

Effects of Plasma Ions/Radicals on Kinetic Interactions in Nanowall Deposition: A Review

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